39944431 has 4 divisors (see below), whose sum is σ = 40086864. Its totient is φ = 39802000.

The previous prime is 39944419. The next prime is 39944453. The reversal of 39944431 is 13444993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13444993 = 1093 ⋅12301.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39944431 is a prime.

It is a super-2 number, since 2×39944431² = 3191115135827522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39941431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70795 + ... + 71356.

It is an arithmetic number, because the mean of its divisors is an integer number (10021716).

Almost surely, 2^39944431 is an apocalyptic number.

39944431 is a deficient number, since it is larger than the sum of its proper divisors (142433).

39944431 is a wasteful number, since it uses less digits than its factorization.

39944431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142432.

The product of its digits is 46656, while the sum is 37.

The square root of 39944431 is about 6320.1606783372. The cubic root of 39944431 is about 341.8367465195.

The spelling of 39944431 in words is "thirty-nine million, nine hundred forty-four thousand, four hundred thirty-one".